OmniCC does not currently update timer text when using :SetCooldownDuration(). Would be nice to have support for it if possible as it's more performant than SetCooldown() for refreshing active cooldowns.

Do you have examples of using this? The only places I've seen it used on Blizzard's end is cooldown:SetCooldownDuration(0)

It's basically just doing e.g cooldown:SetCooldownDuration(26) versus cooldown:SetCooldown(GetTime(), 26) for a cooldown that is already active.
I've never seen Blizzard use this except the one you mentioned, but I have seen it used in other addons. I don't recall which ones though and it is a very rare occurrence.

This should be easy enough for me to work with

This should be implemented in beta3

Thanks, works great!